Ascandinines A-D, Indole Diterpenoids, from the Sponge-Derived Fungus Aspergillus candidus HDN15-152.

Ascandinines A-D, Indole Diterpenoids, from the Sponge-Derived Fungus Aspergillus candidus HDN15-152.

J Org Chem. 2021 Jan 20;:

Authors: Zhou G, Sun C, Hou X, Che Q, Zhang G, Gu Q, Liu C, Zhu T, Li D

Abstract
Four new indole diterpenoids, ascandinines A-D (1-4), were isolated from an Antarctic sponge-derived fungus Aspergillus candidus HDN15-152. Their structures, including absolute configurations, were established based on NMR data, computational calculations, and biosynthetic considerations. Ascandinine A (1) possesses an unprecedented 2-oxabicyclo[2.2.2]octan-3-ol motif embedded in a pentacyclic ring system, while compounds 2-4 represent a rare type of indole diterpenoid featuring the 6/5/5/6/6/6/6-fused ring system. Compound 3 displayed anti-influenza virus A (H1N1) activity with an IC50 value of 26 μM, while compound 4 showed cytotoxicity against HL-60 cells with an IC50 value of 7.8 μM.

PMID: 33472001 [PubMed – as supplied by publisher]

Source: Industry